Myocardium
<span>The heart has
four chambers, four valves. It is composed of cardiac muscles which all
in all pumps blood throughout the human body through the blood vessels.
When something gets injured around the heart, well it will
automatically, in high possibility stop functioning. Take not of the
valves and the most important is the sinoatrial node which is the pace
maker of the heart. It is what triggers the heart to pump itself and the
valves then function and the blood travels and then gets cleansed out
of carbon dioxide in the alveoli.<span> </span></span>
        
             
        
        
        
2 because the 1st energy level can only hold 2 electrons and the 2nd holds 4 
 
        
             
        
        
        
Answer:
b
Explanation:
they have a a physical mass that is easy to absorb through the roots of a plant allowing the plant to make its own energy from said nutrients
 
        
             
        
        
        
Answer:
a cell wall (because a plant cell is less rigid than an animal cell)
- a large central vacuole (where plant cells store water)
- chloroplasts (which plants use to carry out photosynthesis)
Explanation:
 
        
             
        
        
        
Answer:
please mark me brainliest 
Explanation:
The new coronavirus causes severe inflammation in your lungs. It damages the cells and tissue that line the air sacs in your lungs. These sacs are where the oxygen you breathe is processed and delivered to your blood.